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3dc80527ab
esp-idf/Kconfig
Mahavir Jain 3dc80527ab
feat: add compiler config for not merging const sections 
Probably GCC-13.x and on-wards uses "-fmerge-constants" to merge
the const section (string/floating-point) across compilation units.
This makes it difficult to properly analyze the size output of rodata
section across libraries, the merged section (big in size) is showed
across a single library.

The config option added here can help to disable this compiler behavior
and help to provide better size analysis. It can be used during
development phase only as it increases rodata section size.
2024-07-15 10:04:55 +05:30

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#
# Please run the following command for opening a page with more information about this configuration file:
# idf.py docs -sp api-reference/kconfig.html
#
mainmenu "Espressif IoT Development Framework Configuration"
orsource "./components/soc/$IDF_TARGET/include/soc/Kconfig.soc_caps.in"
config IDF_CMAKE
bool
default "y"
config IDF_ENV_FPGA
bool
option env="IDF_ENV_FPGA"
help
- This option is for internal use only.
- Enabling this option will help enable all FPGA support so as to
run ESP-IDF on an FPGA. This can help reproduce some issues that
only happens on FPGA condition, or when you have to burn some
efuses multiple times.
config IDF_ENV_BRINGUP
bool
help
- This option is ONLY used when doing new chip bringup.
- This option will only enable necessary hw / sw settings for running
a hello_world application.
config IDF_CI_BUILD
bool
default y if "$(IDF_CI_BUILD)" = "y" || "$(IDF_CI_BUILD)" = 1
config IDF_DOC_BUILD
bool
default y if "$(IDF_DOC_BUILD)" = "y" || "$(IDF_DOC_BUILD)" = 1
config IDF_TOOLCHAIN
# This option records the IDF target when sdkconfig is generated the first time.
# It is not updated if environment variable $IDF_TOOLCHAIN changes later, and
# the build system is responsible for detecting the mismatch between
# CONFIG_IDF_TOOLCHAIN and $IDF_TOOLCHAIN.
string
default "$IDF_TOOLCHAIN"
config IDF_TOOLCHAIN_CLANG
bool
default "y" if IDF_TOOLCHAIN="clang"
config IDF_TOOLCHAIN_GCC
bool
default "y" if IDF_TOOLCHAIN="gcc"
config IDF_TARGET_ARCH_RISCV
bool
default "n"
config IDF_TARGET_ARCH_XTENSA
bool
default "n"
config IDF_TARGET_ARCH
string
default "riscv" if IDF_TARGET_ARCH_RISCV
default "xtensa" if IDF_TARGET_ARCH_XTENSA
config IDF_TARGET
# This option records the IDF target when sdkconfig is generated the first time.
# It is not updated if environment variable $IDF_TARGET changes later, and
# the build system is responsible for detecting the mismatch between
# CONFIG_IDF_TARGET and $IDF_TARGET.
string
default "$IDF_TARGET"
config IDF_INIT_VERSION
# This option records the IDF version when sdkconfig is generated the first time.
# It is not updated if environment variable $IDF_VERSION changes later
string
default "$IDF_INIT_VERSION"
config IDF_TARGET_LINUX
bool
default "y" if IDF_TARGET="linux"
config IDF_TARGET_ESP32
bool
default "y" if IDF_TARGET="esp32"
select IDF_TARGET_ARCH_XTENSA
config IDF_TARGET_ESP32S2
bool
default "y" if IDF_TARGET="esp32s2"
select FREERTOS_UNICORE
select IDF_TARGET_ARCH_XTENSA
config IDF_TARGET_ESP32S3
bool
default "y" if IDF_TARGET="esp32s3"
select IDF_TARGET_ARCH_XTENSA
config IDF_TARGET_ESP32C3
bool
default "y" if IDF_TARGET="esp32c3"
select FREERTOS_UNICORE
select IDF_TARGET_ARCH_RISCV
config IDF_TARGET_ESP32C2
bool
default "y" if IDF_TARGET="esp32c2"
select FREERTOS_UNICORE
select IDF_TARGET_ARCH_RISCV
config IDF_TARGET_ESP32C6
bool
default "y" if IDF_TARGET="esp32c6"
select FREERTOS_UNICORE
select IDF_TARGET_ARCH_RISCV
config IDF_TARGET_ESP32C5
bool
default "y" if IDF_TARGET="esp32c5"
select FREERTOS_UNICORE
select IDF_TARGET_ARCH_RISCV
config IDF_TARGET_ESP32P4
bool
default "y" if IDF_TARGET="esp32p4"
select IDF_TARGET_ARCH_RISCV
config IDF_TARGET_ESP32H2
bool
default "y" if IDF_TARGET="esp32h2"
select FREERTOS_UNICORE
select IDF_TARGET_ARCH_RISCV
config IDF_TARGET_ESP32C61
bool
default "y" if IDF_TARGET="esp32c61"
select FREERTOS_UNICORE
select IDF_TARGET_ARCH_RISCV
select IDF_ENV_FPGA
config IDF_TARGET_LINUX
bool
default "y" if IDF_TARGET="linux"
config IDF_FIRMWARE_CHIP_ID
hex
default 0x0000 if IDF_TARGET_ESP32
default 0x0002 if IDF_TARGET_ESP32S2
default 0x0005 if IDF_TARGET_ESP32C3
default 0x0009 if IDF_TARGET_ESP32S3
default 0x000C if IDF_TARGET_ESP32C2
default 0x000D if IDF_TARGET_ESP32C6
default 0x0010 if IDF_TARGET_ESP32H2
default 0x0012 if IDF_TARGET_ESP32P4
default 0x0017 if IDF_TARGET_ESP32C5
default 0x0014 if IDF_TARGET_ESP32C61
default 0xFFFF
menu "Build type"
choice APP_BUILD_TYPE
prompt "Application build type"
default APP_BUILD_TYPE_APP_2NDBOOT
help
Select the way the application is built.
By default, the application is built as a binary file in a format compatible with
the ESP-IDF bootloader. In addition to this application, 2nd stage bootloader is
also built. Application and bootloader binaries can be written into flash and
loaded/executed from there.
Another option, useful for only very small and limited applications, is to only link
the .elf file of the application, such that it can be loaded directly into RAM over
JTAG or UART. Note that since IRAM and DRAM sizes are very limited, it is not possible
to build any complex application this way. However for some kinds of testing and debugging,
this option may provide faster iterations, since the application does not need to be
written into flash.
Note: when APP_BUILD_TYPE_RAM is selected and loaded with JTAG, ESP-IDF does not contain
all the startup code required to initialize the CPUs and ROM memory (data/bss).
Therefore it is necessary to execute a bit of ROM code prior to executing the application.
A gdbinit file may look as follows (for ESP32):
# Connect to a running instance of OpenOCD
target remote :3333
# Reset and halt the target
mon reset halt
# Run to a specific point in ROM code,
# where most of initialization is complete.
thb *0x40007d54
c
# Load the application into RAM
load
# Run till app_main
tb app_main
c
Execute this gdbinit file as follows:
xtensa-esp32-elf-gdb build/app-name.elf -x gdbinit
Example gdbinit files for other targets can be found in tools/test_apps/system/gdb_loadable_elf/
When loading the BIN with UART, the ROM will jump to ram and run the app after finishing the ROM
startup code, so there's no additional startup initialization required. You can use the
`load_ram` in esptool.py to load the generated .bin file into ram and execute.
Example:
esptool.py --chip {chip} -p {port} -b {baud} --no-stub load_ram {app.bin}
Recommended sdkconfig.defaults for building loadable ELF files is as follows.
CONFIG_APP_BUILD_TYPE_RAM is required, other options help reduce application
memory footprint.
CONFIG_APP_BUILD_TYPE_RAM=y
CONFIG_VFS_SUPPORT_TERMIOS=
CONFIG_NEWLIB_NANO_FORMAT=y
CONFIG_ESP_SYSTEM_PANIC_PRINT_HALT=y
CONFIG_ESP_DEBUG_STUBS_ENABLE=
CONFIG_ESP_ERR_TO_NAME_LOOKUP=
config APP_BUILD_TYPE_APP_2NDBOOT
bool
prompt "Default (binary application + 2nd stage bootloader)"
depends on !IDF_TARGET_LINUX
select APP_BUILD_GENERATE_BINARIES
select APP_BUILD_BOOTLOADER
select APP_BUILD_USE_FLASH_SECTIONS
config APP_BUILD_TYPE_RAM
bool
prompt "Build app runs entirely in RAM (EXPERIMENTAL)"
select APP_BUILD_GENERATE_BINARIES
endchoice # APP_BUILD_TYPE
# Hidden options, set according to the choice above
config APP_BUILD_GENERATE_BINARIES
bool # Whether to generate .bin files or not
config APP_BUILD_BOOTLOADER
bool # Whether to build the bootloader
config APP_BUILD_TYPE_PURE_RAM_APP
bool
prompt "Build app without SPI_FLASH/PSRAM support (saves ram)"
depends on APP_BUILD_TYPE_RAM
help
If this option is enabled, external memory and related peripherals, such as Cache, MMU,
Flash and PSRAM, won't be initialized. Corresponding drivers won't be introduced either.
Components that depend on the spi_flash component will also be unavailable, such as
app_update, etc. When this option is enabled, about 26KB of RAM space can be saved.
config APP_BUILD_USE_FLASH_SECTIONS
bool # Whether to place code/data into memory-mapped flash sections
config APP_REPRODUCIBLE_BUILD
bool "Enable reproducible build"
default n
select COMPILER_HIDE_PATHS_MACROS
help
If enabled, all date, time, and path information would be eliminated. A .gdbinit file would be create
automatically. (or will be append if you have one already)
config APP_NO_BLOBS
bool "No Binary Blobs"
default n
help
If enabled, this disables the linking of binary libraries in the application build. Note
that after enabling this Wi-Fi/Bluetooth will not work.
config APP_COMPATIBLE_PRE_V2_1_BOOTLOADERS
bool "App compatible with bootloaders before ESP-IDF v2.1"
select APP_COMPATIBLE_PRE_V3_1_BOOTLOADERS
depends on IDF_TARGET_ESP32
default n
help
Bootloaders before ESP-IDF v2.1 did less initialisation of the
system clock. This setting needs to be enabled to build an app
which can be booted by these older bootloaders.
If this setting is enabled, the app can be booted by any bootloader
from IDF v1.0 up to the current version.
If this setting is disabled, the app can only be booted by bootloaders
from IDF v2.1 or newer.
Enabling this setting adds approximately 1KB to the app's IRAM usage.
config APP_COMPATIBLE_PRE_V3_1_BOOTLOADERS
bool "App compatible with bootloader and partition table before ESP-IDF v3.1"
depends on IDF_TARGET_ESP32
default n
help
Partition tables before ESP-IDF V3.1 do not contain an MD5 checksum
field, and the bootloader before ESP-IDF v3.1 cannot read a partition
table that contains an MD5 checksum field.
Enable this option only if your app needs to boot on a bootloader and/or
partition table that was generated from a version *before* ESP-IDF v3.1.
If this option and Flash Encryption are enabled at the same time, and any
data partitions in the partition table are marked Encrypted, then the
partition encrypted flag should be manually verified in the app before accessing
the partition (see CVE-2021-27926).
config APP_INIT_CLK
bool
depends on IDF_TARGET_ESP32
default y if APP_COMPATIBLE_PRE_V2_1_BOOTLOADERS
default y if APP_BUILD_TYPE_RAM
endmenu # Build type
source "$COMPONENT_KCONFIGS_PROJBUILD_SOURCE_FILE"
menu "Compiler options"
choice COMPILER_OPTIMIZATION
prompt "Optimization Level"
default COMPILER_OPTIMIZATION_DEBUG
help
This option sets compiler optimization level (gcc -O argument) for the app.
- The "Debug" setting will add the -0g flag to CFLAGS.
- The "Size" setting will add the -0s flag to CFLAGS.
- The "Performance" setting will add the -O2 flag to CFLAGS.
- The "None" setting will add the -O0 flag to CFLAGS.
The "Size" setting cause the compiled code to be smaller and faster, but
may lead to difficulties of correlating code addresses to source file
lines when debugging.
The "Performance" setting causes the compiled code to be larger and faster,
but will be easier to correlated code addresses to source file lines.
"None" with -O0 produces compiled code without optimization.
Note that custom optimization levels may be unsupported.
Compiler optimization for the IDF bootloader is set separately,
see the BOOTLOADER_COMPILER_OPTIMIZATION setting.
config COMPILER_OPTIMIZATION_DEBUG
bool "Debug (-Og)"
config COMPILER_OPTIMIZATION_SIZE
bool "Optimize for size (-Os)"
config COMPILER_OPTIMIZATION_PERF
bool "Optimize for performance (-O2)"
config COMPILER_OPTIMIZATION_NONE
bool "Debug without optimization (-O0)"
endchoice
choice COMPILER_OPTIMIZATION_ASSERTION_LEVEL
prompt "Assertion level"
default COMPILER_OPTIMIZATION_ASSERTIONS_ENABLE
help
Assertions can be:
- Enabled. Failure will print verbose assertion details. This is the default.
- Set to "silent" to save code size (failed assertions will abort() but user
needs to use the aborting address to find the line number with the failed assertion.)
- Disabled entirely (not recommended for most configurations.) -DNDEBUG is added
to CPPFLAGS in this case.
config COMPILER_OPTIMIZATION_ASSERTIONS_ENABLE
prompt "Enabled"
bool
help
Enable assertions. Assertion content and line number will be printed on failure.
config COMPILER_OPTIMIZATION_ASSERTIONS_SILENT
prompt "Silent (saves code size)"
bool
help
Enable silent assertions. Failed assertions will abort(), user needs to
use the aborting address to find the line number with the failed assertion.
config COMPILER_OPTIMIZATION_ASSERTIONS_DISABLE
prompt "Disabled (sets -DNDEBUG)"
bool
help
If assertions are disabled, -DNDEBUG is added to CPPFLAGS.
endchoice # assertions
choice COMPILER_FLOAT_LIB_FROM
prompt "Compiler float lib source"
default COMPILER_FLOAT_LIB_FROM_RVFPLIB if ESP_ROM_HAS_RVFPLIB
default COMPILER_FLOAT_LIB_FROM_GCCLIB
help
In the soft-fp part of libgcc, riscv version is written in C,
and handles all edge cases in IEEE754, which makes it larger
and performance is slow.
RVfplib is an optimized RISC-V library for FP arithmetic on 32-bit
integer processors, for single and double-precision FP.
RVfplib is "fast", but it has a few exceptions from IEEE 754 compliance.
config COMPILER_FLOAT_LIB_FROM_GCCLIB
bool "libgcc"
config COMPILER_FLOAT_LIB_FROM_RVFPLIB
depends on ESP_ROM_HAS_RVFPLIB
bool "librvfp"
endchoice # COMPILER_FLOAT_LIB_FROM
config COMPILER_OPTIMIZATION_ASSERTION_LEVEL
int
default 0 if COMPILER_OPTIMIZATION_ASSERTIONS_DISABLE
default 1 if COMPILER_OPTIMIZATION_ASSERTIONS_SILENT
default 2 if COMPILER_OPTIMIZATION_ASSERTIONS_ENABLE
config COMPILER_OPTIMIZATION_CHECKS_SILENT
bool "Disable messages in ESP_RETURN_ON_* and ESP_EXIT_ON_* macros"
default n
help
If enabled, the error messages will be discarded in following check macros:
- ESP_RETURN_ON_ERROR
- ESP_EXIT_ON_ERROR
- ESP_RETURN_ON_FALSE
- ESP_EXIT_ON_FALSE
menuconfig COMPILER_HIDE_PATHS_MACROS
bool "Replace ESP-IDF and project paths in binaries"
default y
help
When expanding the __FILE__ and __BASE_FILE__ macros, replace paths inside ESP-IDF
with paths relative to the placeholder string "IDF", and convert paths inside the
project directory to relative paths.
This allows building the project with assertions or other code that embeds file paths,
without the binary containing the exact path to the IDF or project directories.
This option passes -fmacro-prefix-map options to the GCC command line. To replace additional
paths in your binaries, modify the project CMakeLists.txt file to pass custom -fmacro-prefix-map or
-ffile-prefix-map arguments.
menuconfig COMPILER_CXX_EXCEPTIONS
bool "Enable C++ exceptions"
default n
help
Enabling this option compiles all IDF C++ files with exception support enabled.
Disabling this option disables C++ exception support in all compiled files, and any libstdc++ code
which throws an exception will abort instead.
Enabling this option currently adds an additional ~500 bytes of heap overhead
when an exception is thrown in user code for the first time.
config COMPILER_CXX_EXCEPTIONS_EMG_POOL_SIZE
int "Emergency Pool Size"
default 0
depends on COMPILER_CXX_EXCEPTIONS
help
Size (in bytes) of the emergency memory pool for C++ exceptions. This pool will be used to allocate
memory for thrown exceptions when there is not enough memory on the heap.
config COMPILER_CXX_RTTI
bool "Enable C++ run-time type info (RTTI)"
default n
help
Enabling this option compiles all C++ files with RTTI support enabled.
This increases binary size (typically by tens of kB) but allows using
dynamic_cast conversion and typeid operator.
choice COMPILER_STACK_CHECK_MODE
prompt "Stack smashing protection mode"
default COMPILER_STACK_CHECK_MODE_NONE
help
Stack smashing protection mode. Emit extra code to check for buffer overflows, such as stack
smashing attacks. This is done by adding a guard variable to functions with vulnerable objects.
The guards are initialized when a function is entered and then checked when the function exits.
If a guard check fails, program is halted. Protection has the following modes:
- In NORMAL mode (GCC flag: -fstack-protector) only functions that call alloca, and functions with
buffers larger than 8 bytes are protected.
- STRONG mode (GCC flag: -fstack-protector-strong) is like NORMAL, but includes additional functions
to be protected -- those that have local array definitions, or have references to local frame
addresses.
- In OVERALL mode (GCC flag: -fstack-protector-all) all functions are protected.
Modes have the following impact on code performance and coverage:
- performance: NORMAL > STRONG > OVERALL
- coverage: NORMAL < STRONG < OVERALL
The performance impact includes increasing the amount of stack memory required for each task.
config COMPILER_STACK_CHECK_MODE_NONE
bool "None"
config COMPILER_STACK_CHECK_MODE_NORM
bool "Normal"
config COMPILER_STACK_CHECK_MODE_STRONG
bool "Strong"
config COMPILER_STACK_CHECK_MODE_ALL
bool "Overall"
endchoice
config COMPILER_STACK_CHECK
bool
default !COMPILER_STACK_CHECK_MODE_NONE
help
Stack smashing protection.
config COMPILER_NO_MERGE_CONSTANTS
bool "Disable merging const sections"
depends on IDF_TOOLCHAIN_GCC
help
Disable merging identical constants (string/floating-point) across compilation units.
This helps in better size analysis of the application binary as the rodata section
distribution is more uniform across libraries. On downside, it may increase
the binary size and hence should be used during development phase only.
config COMPILER_WARN_WRITE_STRINGS
bool "Enable -Wwrite-strings warning flag"
default "n"
help
Adds -Wwrite-strings flag for the C/C++ compilers.
For C, this gives string constants the type ``const char[]`` so that
copying the address of one into a non-const ``char *`` pointer
produces a warning. This warning helps to find at compile time code
that tries to write into a string constant.
For C++, this warns about the deprecated conversion from string
literals to ``char *``.
config COMPILER_SAVE_RESTORE_LIBCALLS
bool "Enable -msave-restore flag to reduce code size"
depends on IDF_TARGET_ARCH_RISCV
help
Adds -msave-restore to C/C++ compilation flags.
When this flag is enabled, compiler will call library functions to
save/restore registers in function prologues/epilogues. This results
in lower overall code size, at the expense of slightly reduced performance.
This option can be enabled for RISC-V targets only.
config COMPILER_DISABLE_DEFAULT_ERRORS
bool "Disable errors for default warnings"
default "y"
help
Enable this option if you do not want default warnings to be considered as errors,
especially when updating IDF.
This is a temporary flag that could help to allow upgrade while having
some time to address the warnings raised by those default warnings.
Alternatives are:
1) fix code (preferred),
2) remove specific warnings,
3) do not consider specific warnings as error.
config COMPILER_DISABLE_GCC12_WARNINGS
bool "Disable new warnings introduced in GCC 12"
default "n"
help
Enable this option if use GCC 12 or newer, and want to disable warnings which don't appear with
GCC 11.
config COMPILER_DISABLE_GCC13_WARNINGS
bool "Disable new warnings introduced in GCC 13"
default "n"
help
Enable this option if use GCC 13 or newer, and want to disable warnings which don't appear with
GCC 12.
config COMPILER_DUMP_RTL_FILES
bool "Dump RTL files during compilation"
help
If enabled, RTL files will be produced during compilation. These files
can be used by other tools, for example to calculate call graphs.
choice COMPILER_RT_LIB
prompt "Compiler runtime library"
default COMPILER_RT_LIB_CLANGRT if IDF_TOOLCHAIN_CLANG
default COMPILER_RT_LIB_HOST if IDF_TARGET_LINUX
default COMPILER_RT_LIB_GCCLIB
help
Select runtime library to be used by compiler.
- GCC toolchain supports libgcc only.
- Clang allows to choose between libgcc or libclang_rt.
- For host builds ("linux" target), uses the default library.
config COMPILER_RT_LIB_GCCLIB
depends on !IDF_TARGET_LINUX
bool "libgcc"
config COMPILER_RT_LIB_CLANGRT
depends on IDF_TOOLCHAIN_CLANG && !IDF_TARGET_LINUX
bool "libclang_rt"
config COMPILER_RT_LIB_HOST
depends on IDF_TARGET_LINUX
bool "Host"
endchoice
config COMPILER_RT_LIB_NAME
string
default "clang_rt.builtins" if COMPILER_RT_LIB_CLANGRT
default "gcc" if COMPILER_RT_LIB_GCCLIB
default "" if COMPILER_RT_LIB_HOST
choice COMPILER_ORPHAN_SECTIONS
prompt "Orphan sections handling"
default COMPILER_ORPHAN_SECTIONS_WARNING
depends on !IDF_TARGET_LINUX
help
If the linker finds orphan sections, it attempts to place orphan sections after sections of the same
attribute such as code vs data, loadable vs non-loadable, etc.
That means that orphan sections could placed between sections defined in IDF linker scripts.
This could lead to corruption of the binary image. Configure the linker action here.
config COMPILER_ORPHAN_SECTIONS_WARNING
bool "Place with warning"
help
Places orphan sections without a warning message.
config COMPILER_ORPHAN_SECTIONS_PLACE
bool "Place silently"
help
Places orphan sections without a warning/error message.
endchoice
config COMPILER_STATIC_ANALYZER
bool "Enable compiler static analyzer"
default "n"
depends on IDF_TOOLCHAIN_GCC
help
Enable compiler static analyzer. This may produce false-positive results and increases compile time.
endmenu # Compiler Options
menu "Component config"
source "$COMPONENT_KCONFIGS_SOURCE_FILE"
endmenu
config IDF_EXPERIMENTAL_FEATURES
bool "Make experimental features visible"
default "n"
help
By enabling this option, ESP-IDF experimental feature options will be visible.
Note you should still enable a certain experimental feature option to use it, and you
should read the corresponding risk warning and known issue list carefully.
Current experimental feature list:
- CONFIG_ESPTOOLPY_FLASHFREQ_120M && CONFIG_ESPTOOLPY_FLASH_SAMPLE_MODE_DTR
- CONFIG_SPIRAM_SPEED_120M && CONFIG_SPIRAM_MODE_OCT
- CONFIG_BOOTLOADER_CACHE_32BIT_ADDR_QUAD_FLASH
- CONFIG_MBEDTLS_USE_CRYPTO_ROM_IMPL
- CONFIG_ESP_WIFI_EAP_TLS1_3
- CONFIG_ESP_WIFI_ENABLE_ROAMING_APP
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